What's the most expensive gemstone in the world?

Isn't the hope diamond still the most expensive?

Pariba tourmaline or Alexandrite

I think the most and rarest gemstone is alexandrate. It's valuable and expensive as it is hard to find. As of the origins, i think it could be found in the high altitude mountains. However, i have seen some rubys that turn the water in red, but alexandrite, i haven't seen it though. i had just heard it so far.

Rubies are only sapphires turned red, any Crystallogist can tell you that.

The only AVAILIABLE gem that is most expensive is the Alexandrite, which is the real birthstone for June.
Most goldsmiths and jewellers will not carry it because most of the time you can only find lab-made, synthetic, or pulled Alexandrite.
it it around $50 000/crt

No, actually diamonds are NOT all that expensive compared to other gems. De Beers (diamond marketer) keeps them in vaults to raise the rairity/price.

Rubies are actually sapphires, but are called rubies once they turn red. They are usually around the same as diamonds.

One of the most expensive is the Alexandrite gem, which sells for about $30 000 and up for only 1 carat, where a diamond sells for about $1 000 to $2 000 a carat.
BUT the most expensive gems are in the guiness book of records, you cant buy them.

Flawless blue diamond, the most expensive gemstone in the world, sells at auction for £4m

It's all just corundum.

Next to certain rare colors of diamond (such as blue, pink and red), jadeite is the world‘s most expensive gem, with prices above even ruby and sapphire. The record price for a single piece of jadeite jewelry was set at the November 1997 Christie’s Hong Kong sale: Lot 1843, the “Doubly Fortunate” necklace of 27 approximately 15 mm jadeite beads, sold for US$9.3 million . Indeed, out of the top ten most expensive jewels sold worldwide by Christie’s in 1999, five out of ten were jadeite, including three of the top four. These auctions clearly show that jadeite is among the most valuable of all gemstones. The most valuable jadeites are those of high translucency and rich Cr-green color.
Nephrite has little value as a gem in and of itself, but carvings can be quite valuable.

To correct Kristen's answer, Amethyst is not a rare or expensive stone. It's in the semi-precious category of gemstones. Diamond, Emerald, Ruby, and Sapphire are the only stones considered to be "Precious", though I do feel Alexandrite should be in the precious category.

diamond

IDK but the one that woman threw into the Ocean in the Movie Titanic looked awful valuable.
That drove me nuts. All the people who could have been fed with the proceeds from that and she just threw it in the Ocean. I know, I know.....just a movie, but still............

Per karat, I believe the ruby is the most valuable.

...Mental Floss. Gotta love trivia boad games.

The diamond in the scepter of the crown jewels of England is the most valuable. its worth is incalculable. its over 500 karats and was cut from the great Collins stone.

i believe natural rubies is the most expensive gemstone. compare to diamonds, sapphire and emerald. good quality rubies are very rare. we can easily find diamonds, sapphire and emerald of superb quality if we have got the money but try to find rubies, i bet it will be extremely difficult to find.

Natural Fancy Vivid Red Diamonds are far and away the most expensive gemstones on earth. Nothing comes even remotely close to them in price. A perfect, IF Natural fancy vivid red diamond (has never been graded by any lab i'm aware of), would, in my humble opinion exceed 5 million USD. per carat. The famed Red Shield would be worth 30,000,000.00 or more. That stone is just over 5 carats. There is no 5 carat stone on this planet that could compare in monetary value to that. Second to natural fancy vivid red diamonds are natural fancy vivid greens, these too are exceedingly rare in pure green states. The 45+ carat Dresden Green is, in my humble opinion the single most valuable stone on this planet. It is truely priceless.

The natural fancy vivid red diamond is far and away the rarest and by far, most expensive gemstone on earth. An 8.01 carat ruby was purchased in 2005 for 2.2 million. The 5.11 carat Moussaieff Red, a shield cut fancy red (not even vivid red)diamond is arguably the most valuable stone on earth per carat. At auction it could exceed 2.2 million per carat. A vivid red of the same size would be in my humble opinon priceless. Suggesting amethyst at a laughable 50.00 per carat, for sheer perfecion, compares with any of the top 4 is beyond noobish.

The most expensive gems are known as the "Big Four". Diamond, ruby, sapphire and emerald. But there are many kinds of stones worth calling "precious". For example; alexandrite, black opal(Australian and Ethiopian), jadiete jade(the most expensive stone in Asia), Tanzanite(zoisite) and Tsavorite(green garnet).
But a great care must be taken when purchasing stones. There are times when even a Diamond gets very cheap, cheap as a piece of a cheap walkman. Intensity of a color, its depth, carat weight, tranparency, type of the cut if its a finished stone and ofcourse clarity. I guess I just mentioned the four "Cs" to value gems. If one has a great intertest in gems, whether for collecting or business, I advice to join GIA, Gemological Institute of America, number one in its kind responsible for setting the first Diamond Grading formula in the world.
For more info on please visit www.gia.com or you can contact me just for advice at bkseifu@yahoo.com or svsm64@yahoo.com. Thanks, Brook

Referring to the answer to the most expensive gemstone in the world,

What would you value a natural uncut ruby/diamond/saphire that weight about 4.5kg?

Do you have any idea what it is worth?

The most expensive gemstone is the red beryl (aka red emerald). These are the rarest of gemstones. Because of their rarity, the prices of these stones can be over $5,000 per carat (http://tinyurl.com/hojfv). This is opposed to emerald which is (as of this writing) is going for less than $1,000 per carat (http://tinyurl.com/fhl9c).

Red beryl has a very intense raspberry to ruby red color that is derive from manganese in its structure. Gem quality stones are only found in one place in the entire world, South Western Utah. (I have actually been to the mine.) It's not a very big mine and there are not many people that that work it. The original owner of the mine (the Harris Group) was a small family operation that made millions working the mine just a few days each year.

For more information on this gemstone Google "red beryl" or "red emerald".

Emerald, by its weight, is the most valuable and thus expensive gemstone in the world. However, it is much harder to find an emerald without noticeable inclusions than a diamond, so when shopping for stones, diamonds will often be more expensive. Emerald is one of the five precious stones, which are usually the most expensive: diamond, emerald, ruby, sapphire, and amethyst.

the most expencive and rare jem stone in the world is a Painite stone.

hope diamond

Black opal is definitely one of the rarest and most expensive gems in the world..because of its uniqueness and opaqueness.. Even search it on google..

Colorless Diamond

Natural Fancy Vivid Red Diamonds are by far the most expensive gemstone on earth. Nothing comes even remotely close in price. A perfect, if Natural fancy colored diamonds red (not rated by any lab that I am aware) would, in my humble opinion more than 5 million dollars. per carat. The famous Red Shield 30,000,000.00 worth or more Mensagens para Orkut .This stone is a little over 5 carats. There is no stone of 5 carats in this planet that could compare in monetary value to that. Second beautiful natural diamonds are bright red natural fancy vivid green, they are also extremely rare in the states clean green. 45 + carat Dresden Green is, in my humble opinion the world's most valuable stone. It is truly priceless. ...

Fancy coloured diamonds are probably the most expensive gemstones, if you can find them, but some rubies or sapphires can also go for millions.

To be honest at that level the "prices" are a bit of a mystery as those kind of gemstones will either be sold in private, at exclusive auctions or be held in museum collections so the price can fluctuate wildly depending on who is interested in buying.

I prefer more affordable Amethyst Jewellery and marcasite jewellery myself.

I think Burmese Rubies have caught the highest pricetags in history. Well abazias.com also providing different type of jewelry products like loose diamonds, engagement rings

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Fine ruby of 8.62 cts. wedding rings was sold recently for $425.000 per ct. making a stone price of $3,663,500 + 10% fee to the auction house. This is not the highest stone price for a ruby but by a long way the highest carat price ever paid.
The highest carat price for any gemstone was for a 0.99 ct. blood red diamond which sold for $1,000,000 the stone which works out at $1,010,101 per ct.
Of course the world's famous great diamonds could possibly reach higher prices but there is almost no chance that they will ever come on to the open market as they are held by nations or museums.

Actually, the MOST expensive gem in the world was sold in November 16, 2010 at Sotheby's Geneva to diamond dealer Laurence Graff. Formerly sold by Harry Winston 60 years ago, this Fancy Intense Pink diamond, of VVS2 clarity, weighing 24.78 carats, sold again for 46,158,673.80 US$!!! Although obviously pink in color, the stone belongs to a rare class of diamonds with exceptional purity: type IIa. It is thought that the rare pink color is attributed to plastic deformation under extreme pressure of the usually transparently clear crystalline structure. The color was simply showcased in it's smoothly rounded emerald cut.

(http://www.sothebys.com/app/live/lot/LotDetail.jsp?lot_id=159646671)

When not speaking of specific gems that were sold as a certain carat weight specimen. The most expensive gemstone type in the world is Jadeite at roughly 3 million
dollars (US) per carat.

The correct answer all depends on the meaning behind the question. As for the most expensive SINGLE gemstone? It's going to be one of two stones at the Smithsonian. Either it will be the Hope Diamond or their 65.7 carat Alexandrite. As for what is the most expensive gemstone type, it is the Alexandrite. Top specimens of this stone are worth $100,000USD per carat.

Not the most expensive but very rare gems for a great price you can find here: http://freakingcat.com/

All things considered, diamond. Any other gemstone can easily sell for well under a hundred dollars per carat, depending on the quality and where you buy it. Not so with diamonds, however. Even the worst-quality diamonds you cannot get for under a few hundred dollars a carat no matter how ugly.

In general, diamonds. Sapphires. Rubies. But Lunar and meteor stones are more rare and should be more valuable.

picanite

The “Vivid Pink” diamond ring sold for $10.8 in Hong Kong in December 2009.

The “Mouawad” diamond necklace sold for $12 million.

The “Wittelsbach” blue diamond sold for $24.3 million in 2008.

The value of the Crown Jewels of England is not known, but estimates go up to hundreds of millions of dollars. They are valued for insurance purchases but that number is kept secret.